<template>
  <div>
    <NavBar>
      <div slot="left" class="back" @click="backClick">
        <img src="~assets/img/common/back.svg" alt="">
      </div>
      <div slot="center" class="title">
        <div v-for="(item,index) in titles" 
        :key="item" class="title-item" 
        :class="{active: index === currentIndex}" @click="titleClick(index)">{{ item }}</div>
      </div>
    </NavBar>
  </div>
</template>

<script>
import NavBar from 'components/common/navbar/NavBar'

export default {
  name:'DetailNavBar',
  components: {
    NavBar
  },
  data() {
    return {
      titles: ['商品','参数','评论','推荐'],
      currentIndex:0
    }
  },
  methods: {
    titleClick(index) {
      this.currentIndex = index;
      this.$emit('titleClick',index);
      // console.log(index);
    },
    //返回按钮
    backClick() {
      this.$router.back();
    }
  },
  created() {

  }
}
</script>

<style scoped>
  .title {
    display: flex;
  }
  .title-item {
    flex: 1;
    font-size: 16px;
  }
  .active {font-weight: bold;
    color: #f40;
  }
  .back {
    margin-top: 4px;
  }
</style>